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Reminds me of XBMC - Xbox Media Centre - (since renamed to Kodi) which runs on much more than Xbox (if it even runs on Xbox any more at all...)

It's now an UWP app, so it's full circle and runs on Xbox One.

mpv (mpv.io) also has support for using it to stream videos. (play from the internet, rather than downloading)

https://addons.mozilla.org/en-US/firefox/addon/open-with/ is available for firefox and chrome, and lets you open URLs from the context menu. Massive time saver, as you can just right click on a link to a video, and it'll start playing in a separate media player.

I keep expecting the maintainers to change the name some day... I mainly use it to archive content from Arte. I'm usually not in the +7 days cycle their website has.